EP0770188A4 - Procede et systeme de revetement facilitant le nettoyage d'un palier hydrodynamique et structure secondaire d'etancheite obtenue - Google Patents

Procede et systeme de revetement facilitant le nettoyage d'un palier hydrodynamique et structure secondaire d'etancheite obtenue

Info

Publication number
EP0770188A4
EP0770188A4 EP96914588A EP96914588A EP0770188A4 EP 0770188 A4 EP0770188 A4 EP 0770188A4 EP 96914588 A EP96914588 A EP 96914588A EP 96914588 A EP96914588 A EP 96914588A EP 0770188 A4 EP0770188 A4 EP 0770188A4
Authority
EP
European Patent Office
Prior art keywords
surface tension
hydrodynamic bearing
lubricant
bearing
tension seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96914588A
Other languages
German (de)
English (en)
Other versions
EP0770188A1 (fr
Inventor
Carl D Williams
Shuo-Hao Chen
Jackie Cordova
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Quantum Corp
Original Assignee
Quantum Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Quantum Corp filed Critical Quantum Corp
Publication of EP0770188A1 publication Critical patent/EP0770188A1/fr
Publication of EP0770188A4 publication Critical patent/EP0770188A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
    • F16C33/107—Grooves for generating pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/12—Structural composition; Use of special materials or surface treatments, e.g. for rust-proofing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/74—Sealings of sliding-contact bearings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49639—Fluid bearing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49702—Lubricating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49705—Coating or casting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49885—Assembling or joining with coating before or during assembling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49993—Filling of opening

Definitions

  • the present invention is related to the subject matter of United States Patents No.: 4,795,275 for "Hydrodynamic Bearing” issued January 3, 1989; 5,067,528 for “Hydrodynamic Bearing” issued November 26, 1991; and 5,112,142 for “Hydrodynamic Bearing” issued May 12, 1992, all issuing to Digital Equipment Corporation and now assigned to Quantum Corporation, Milpitas, California, assignee of the present invention.
  • the present invention is also related to the subject matter of United States Patent Applications Serial No. 08/388,380 filed February 14, 1995 for "Hydrodynamic Bearing Having Inverted Surface Tension Seals” and Serial No. 08/363,566 filed December 22, 1994 for “Self-Contained Hydrodynamic Bearing Unit", both also assigned to Quantum Corporation.
  • the disclosures of the foregoing patents and patent applications are hereby specifically incorporated herein by this reference.
  • the present invention relates, in general, to the field of hydrodynamic bearings and the manufacture thereof. More particularly, the present invention relates to a coating system and method for facilitating the cleaning of hydrodynamic bearings and their associated structure by applying a surface energy lowering coating to selected portions of the bearing other than substantially within the surface tension seal producing gaps thereof prior to a lubricant fill.
  • the coating system and method of the present invention may also advantageously be utilized to produce a secondary barrier seal extending a relatively short distance into and adjoining the opening of the surface tension seal producing gaps.
  • Hydrodynamic bearings offer significant advantages over conventional ball bearings in a number of applications, particularly with respect to the rotation of one or more storage media concentrically affixed to a central hub about a disk drive spindle.
  • the aforementioned United States patents describe the advantages and structure of a typical hydrodynamic bearing comprising a central shaft (or journal) , axially disposed thrust plates and a surrounding sleeve having an intermediate lubricating fluid contained therein to allow relative motion between the shaft and sleeve.
  • a preferred method of filling a hydrodynamic bearing with the lubricating fluid comprising, inter alia, the steps of placing the bearing in a vacuum above the lubricant, submerging the bearing in the lubricant and then, while remaining fully submerged in the lubricant, exposing the system to atmospheric pressure.
  • a non- wetting, or surface energy reducing coating may then be applied to the outer edges of the bearing seals following the lubricant fluid fill to help deter lubricant from escaping from the seals.
  • a non- wetting, or surface energy reducing coating may then be applied to the outer edges of the bearing seals following the lubricant fluid fill to help deter lubricant from escaping from the seals.
  • extreme care must be exercised in the application of the coating and the selection of the areas to which it is applied to avoid contamination of the lubricant.
  • the surface energy of the metal surface of the bearing is also much higher than the typical lubricant oil, making removal of excess lubricant from the metal surface very difficult, particularly without the continuing availability of effective solvents such as chlorofluorocarbons ("CFCs" e.g. FreonTM) .
  • CFCs chlorofluorocarbons
  • a particular embodiment of the present invention contemplates the selective application of a surface energy reducing coating, for example, a synthetic fluorine containing resin such as TeflonTM or a thin film barrier material which exhibits low surface energy and inhibits surface spread or migration of lubricating fluid such as NYEBARTM, to the entire outer surface of the hydrodynamic bearing prior to the lubricant fluid fill.
  • a surface energy reducing coating for example, a synthetic fluorine containing resin such as TeflonTM or a thin film barrier material which exhibits low surface energy and inhibits surface spread or migration of lubricating fluid such as NYEBARTM, to the entire outer surface of the hydrodynamic bearing prior to the lubricant fluid fill.
  • the bearing may be set within a fixture which is operative to selectively occlude selected portions of the surface tension seal forming gaps allowing the outer bearing surfaces to be covered with the coating by spraying, immersion or other means while simultaneously preventing the coating from later contaminating the lubricant or otherwise interfering with the surface tension seal to
  • the coating may also be allowed to extend a relatively short distance within the gap, but displaced from the surface tension seal itself, to provide a secondary barrier bead at the periphery of the gap to augment retention of the lubricant within the seals.
  • a hydrodynamic bearing including a centrally disposed shaft and a circumferentially surrounding sleeve for relative motion therebetween.
  • the bearing further includes a void for retaining a lubricant fluid disposed intermediate the shaft and the sleeve wherein the lubricant fluid may form at least one surface tension seal within a gap communicating with an exterior surface of the shaft and the sleeve.
  • the improvement comprises a surface energy reducing coating applied to the exterior surface of the shaft and the sleeve.
  • the coating which may comprise a synthetic fluorine containing resin, extends at least partially within the gap displaced from the surface tension seal.
  • a system and method for removing excess lubricant from the exterior surfaces of a hydrodynamic bearing having at least one surface tension seal forming gap disposed between a shaft and a circumferentially surrounding sleeve comprises means for selectively occluding predetermined portions of the surface tension seal forming gap and means for applying a surface energy reducing coating to the exterior surfaces of the hydrodynamic bearing while the predetermined portions of the surface tension seal forming gap are occluded.
  • the system further comprises means for filling the hydrodynamic bearing with a lubricant to produce a surface tension seal within the surface tension seal forming gap and means for removing excess areas of the lubricant from the exterior surfaces of the hydrodynamic bearing coated with the surface energy reducing coating.
  • Fig. 1 is a cross-sectional, side elevational view of a coating system in accordance with the present invention for applying a surface energy lowering coating to selected portions of a typical hydrodynamic bearing utilizing a pair of fixtures for occluding selected portions of the surface tension seal producing gaps thereof prior to a lubricant fluid fill step;
  • Fig. 2 is an enlarged cross-sectional, side elevational view of a portion of the hydrodynamic bearing of Fig. 1 illustrating the insertion of a distal ridge extending from an annular extension of a fixture within a surface tension producing gap of the bearing as a surface energy lowering coating is applied, for example, by spraying on the outer surfaces thereof;
  • Fig. 3 is a follow on, cross-sectional, side elevational view of the same portion of the hydrodynamic bearing of Fig. 2 with the fixture removed from the surface tension seal producing gap and the bearing being filled with a lubricant fluid following the application of a surface energy lowering coating illustrating the production of a secondary barrier bead displaced from the surface tension seal and excess lubricant adjoining the coating on the bearing outer surfaces;
  • Fig. 4 is a cross-sectional, side elevational view of a hydrodynamic bearing and a circumferentially surrounding hub comprising a portion of, for example, a disk drive spindle assembly wherein the bearing and hub are pressed or otherwise affixed to each other prior to a vacuum dip lubricant fill of the bearing illustrating the possible utilization of vacuum and air cannulae for removing excess lubricant fluid from the surface energy lowering coating covered outer surfaces thereof; and
  • Fig. 5 is a bottom plan view of the hydrodynamic bearing and hub of Fig. 4.
  • a surface energy reducing coating for example, a synthetic fluorine containing resin such as TeflonTM or a thin film barrier material which exhibits low surface energy and inhibits surface spread or migration of lubricating fluid such as NYEBARTM, is sprayed or otherwise deposited onto the outer surfaces of a hydrodynamic bearing 12 other than within selected portions of the surface tension seal producing gaps thereof.
  • the coating system 10 contemplates the utilization of first and second fixtures 14, 16 to selectively occlude selected portions of the surface tension seal forming gaps of the hydrodynamic bearing 12 prior to application of a surface energy reducing coating to the exterior surfaces of the bearing 12.
  • the hydrodynamic bearing 12 conventionally incorporates a central shaft or journal 18 and a circumferentially surrounding sleeve 20.
  • First and second surface tension seal producing gaps 22, 24 allow formation of a surface tension seal to maintain a lubricant fluid between the shaft 18 and surrounding sleeve 20.
  • the sleeve 20 further includes a bushing 26 secured thereto or formed as a part thereof.
  • First and second thrust plates 28, 30 adjoin the portions of the shaft 18 adjacent the ends of the sleeve 20.
  • the first and second thrust plates 28, 30 may be formed as a portion of the shaft 18 or rigidly affixed thereto by other means.
  • the bearing 12 also includes a void 32 for containing a lubricant fluid intermediate the shaft 18 and surrounding bushing 26 as well as one or more passageways 34 as described in the aforementioned United State Patents.
  • the first and second fixtures 14, 16 comprise a cup-shaped member 40 having a concave cavity 42 formed therein to adjoin the opposing ends of the shaft 18 of the bearing 12.
  • the members 40 are urged toward the ends of the bearing 12 and held in position with respect thereto and are later retracted from the bearing 12 following the application of the surface energy reducing coating as will be more fully described hereinafter.
  • the members 40 further include an annular extension 44 having a distal ridge 46 formed thereon for insertion within the first and second surface tension seal producing gaps 22, 24 as shown.
  • the first and second fixtures 14, 16 also include a channel 48 which communicates with the concave cavity 42 to allow application of the surface energy reducing coating to the portions of the bearing adjoining the ends of the shaft 18 and first and second thrust plates 28, 30. By means of the channel 48, the coating may be applied to the thrust plate outer surfaces 52 in addition to the sleeve outer surfaces 50 not covered by the first and second fixtures 14, 16.
  • the fixtures 14, 16 include channels extending through the annular extension 44 and distal ridge 46 to enable a lubricant fluid to be applied to the first and second surface tension seal producing gaps 22, 24 to effectuate a lubricant fill operation of the bearing 12 in addition to providing the selective occlusion of the first and second surface tension seal producing gaps 22, 24 as disclosed herein.
  • Fig. 2 a more detailed view of the coating system 10 of the present invention is shown.- In this illustration, the lubricant void 60 intermediate the sleeve 20 and shaft 18 (including the first thrust plate 28) is shown.
  • the lubricant void 60 will be filled with a lubricant fluid following the deposition of the surface energy reducing coating 62 as shown.
  • the annular extension 44 which includes the distal ridge 46, extends within the first surface tension seal producing gap 22 to selectively occlude portions of the gap prior to application of the coating 62 when the first fixture 14 is urged toward engagement with the bearing 12.
  • the coating 62 may be applied by spraying, immersion or other deposition technique to effectuate its adherence to the outer surfaces of the bearing including the sleeve outer surface 50 and the thrust plate outer surface 52.
  • a secondary barrier bead 64 comprising the coating 62 may also be formed which extends a relatively short distance within the first surface tension seal producing gap 22 as will be further illustrated hereinafter.
  • a lubricant fluid 66 has been inserted within the lubricant void 60 to ultimately form a surface tension seal 68 within the first surface tension seal producing gap 22.
  • the bearing 12 may be filled with the lubricant fluid 66 through a number of techniques including a vacuum/immersion technique as well as through the use of the fixtures 14, 16 as previously described.
  • the surface tension seal 68 extends partially within the first surface tension seal producing gap 22 leaving a gap sidewall 70 extending up to the gap/bead interface 72 adjoining the secondary barrier bead 64.
  • the secondary barrier bead 64 extends a relatively short distance within the first surface tension seal producing gap 22 but is displaced from the surface tension seal 68 itself.
  • a small amount of the lubricant fluid 66 comprising a liquid film of on the order of only a few angstroms may adjoin the gap sidewall 70 despite the formation of the surface tension seal 68.
  • the secondary barrier bead 64 formed of the coating 62 will function to further preclude the escape of any of the lubricant fluid 66 from the first surface tension seal producing gap 22.
  • excess lubricant 74 which may partially adhere to the coating 62 will tend to bead up and roll off following the lubricant fluid 66 fill of the bearing 12. Any excess lubricant 74 which remains on the coated surfaces can be readily removed with a blast of air or by means of a vacuum suction applied adjacent the surface.
  • a system for removing excess lubricant 74 from the coated surfaces of a hydrodynamic bearing and associated structure comprising a cleaning system 80.
  • the cleaning system 80 is utilized in conjunction with a spindle 82 and circumferentially surrounding hub 84 as may be utilized, for example, as a spindle assembly for a computer mass storage disk drive.
  • the hub 84 may be formed as a portion of the spindle 82 sleeve or otherwise rigidly affixed thereto through various techniques.
  • the spindle 82 incorporates a hydrodynamic bearing having surface tension seals 86, 88 as previously described.
  • the hub 84 presents a motor cavity 90 for retention of the various motor elements for electrically rotating the hub 84 about the shaft of the spindle 82.
  • the bearing portion of the spindle 82 is filled with a lubricant fluid while the same is affixed to the hub 84.
  • This may, therefore, result in excess lubricant 74 adhering to various surfaces of the hub as well when the bearing is filled in a vacuum immersion process for example.
  • the outer surfaces of the hub 84 may also have been previously coated with the surface energy reducing coating as described above, the excess lubricant 74 can be removed by a suction force applied through a vacuum cannula 92 in conjunction with, or in lieu of, a blast of air applied through an air cannula 94.
  • the excess lubricant 74 may also be removed by wiping, such as with a clean rag or the like.
  • the coating 62 may be a surface energy reducing coating, for example, a synthetic fluorine containing resin such as TeflonTM dissolved or suspended in a solvent.
  • a surface energy reducing coating for example, a synthetic fluorine containing resin such as TeflonTM dissolved or suspended in a solvent.
  • first and second fixtures 14, 16 exposes only the exterior areas of the bearing 12 or hub 84 intended to be coated with the coating 62.
  • a curing step may be effectuated by means of baking the structure at an elevated temperature for a predetermined period of time.
  • the baking process can take place either prior to or after removal of the first and second fixtures 14, 16 from engagement with the hydrodynamic bearing 12.
  • any excess lubricant 74 which might still remain on the surface may be removed by adding a small amount of solvent to the air blast to help absorb the excess lubricant 74.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

Procédé et système (10) de revêtement facilitant le nettoyage des paliers hydrodynamiques (12) et de leur structure associée, procédé consistant à appliquer un revêtement (62) réduisant l'énergie en surface sur des parties sélectionnées du palier autres que les vides (22, 24) formant un joint à tension superficielle avant que ceux-ci ne soient remplis d'un fluide lubrifiant (66). Le procédé et le système de revêtement de la présente invention peuvent également être utilisés, avec efficacité, pour former un joint secondaire formant barrière (64) s'étendant sur une distance relativement courte à l'intérieur de l'orifice d'entrée des vides (22, 24) formant un joint à tension superficielle, et à proximité de cet orifice.
EP96914588A 1995-05-09 1996-05-06 Procede et systeme de revetement facilitant le nettoyage d'un palier hydrodynamique et structure secondaire d'etancheite obtenue Withdrawn EP0770188A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US43799595A 1995-05-09 1995-05-09
US437995 1995-05-09
PCT/US1996/006380 WO1996035884A1 (fr) 1995-05-09 1996-05-06 Procede et systeme de revetement facilitant le nettoyage d'un palier hydrodynamique et structure secondaire d'etancheite obtenue

Publications (2)

Publication Number Publication Date
EP0770188A1 EP0770188A1 (fr) 1997-05-02
EP0770188A4 true EP0770188A4 (fr) 1999-12-01

Family

ID=23738791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96914588A Withdrawn EP0770188A4 (fr) 1995-05-09 1996-05-06 Procede et systeme de revetement facilitant le nettoyage d'un palier hydrodynamique et structure secondaire d'etancheite obtenue

Country Status (5)

Country Link
US (1) US5768784A (fr)
EP (1) EP0770188A4 (fr)
JP (1) JPH10503832A (fr)
KR (1) KR970704972A (fr)
WO (1) WO1996035884A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0812394B1 (fr) * 1995-12-22 2001-09-12 Koninklijke Philips Electronics N.V. Palier a rainures dynamiques a sillon en v formant barriere d'huile
JP2001200838A (ja) * 1999-11-09 2001-07-27 Seiko Instruments Inc 流体動圧軸受、流体動圧軸受装置、流体動圧軸受の製造方法、及び軸受表面加工方法
JP3727250B2 (ja) * 2001-04-04 2005-12-14 松下電器産業株式会社 流体軸受装置およびこれを用いた磁気ディスク装置
US20030224198A1 (en) * 2002-01-11 2003-12-04 Nissan Technical Center North America, Inc. Reusable masking device for sprayable bed liner
US7040019B2 (en) * 2002-04-03 2006-05-09 Ntn Corporation Method and apparatus for manufacturing hydro dynamic bearing device
US6854889B2 (en) * 2003-03-04 2005-02-15 Nidec Corporation Hydrodynamic pressure bearing, spindle motor in which it is utilized, and disk-drive device furnished with the spindle motor
JPWO2008129675A1 (ja) * 2007-04-18 2010-07-22 東芝ストレージデバイス株式会社 スピンドルモータおよびキャリッジアセンブリ並びに記憶媒体駆動装置

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Publication number Priority date Publication date Assignee Title
US3500525A (en) * 1967-11-28 1970-03-17 Nasa Method of lubricating rolling element bearings
JPS5850321A (ja) * 1981-09-18 1983-03-24 Matsushita Electric Ind Co Ltd 軸受装置
NL8303833A (nl) * 1983-11-08 1985-06-03 Philips Nv Spiraalgroeflager met metaalsmering en antibevochtigingslaag.
US5112142A (en) * 1987-08-12 1992-05-12 Digital Equipment Corporation Hydrodynamic bearing
US4795275A (en) * 1987-08-12 1989-01-03 Digital Equipment Corporation Hydrodynamic bearing
US5067528A (en) * 1989-07-19 1991-11-26 Digital Equipment Corporation Hydrodynamic bearing
US4928376A (en) * 1989-07-31 1990-05-29 Motorola Inc. Method for filling a cavity, such as a sensor cavity, with an incompressible fluid
JPH05133416A (ja) * 1991-11-07 1993-05-28 Nippon Thompson Co Ltd 防振性を有する直動案内ユニツト及びその製造方法
US5328271A (en) * 1992-05-06 1994-07-12 Maxtor Corporation Hydrodynamic spindle bearing for ultra-slim disk storage unit
JPH0666319A (ja) * 1992-06-19 1994-03-08 Nippon Thompson Co Ltd 転がり案内ユニット及びその製造方法
US5484212A (en) * 1994-01-14 1996-01-16 Heidelberger Druckmaschinen Ag Method of lubricating printing cyclinder bearings
US5427456A (en) * 1994-04-12 1995-06-27 Synektron Corporation Fluid bearing with asymmetrical groove pattern

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9635884A1 *

Also Published As

Publication number Publication date
KR970704972A (ko) 1997-09-06
US5768784A (en) 1998-06-23
EP0770188A1 (fr) 1997-05-02
WO1996035884A1 (fr) 1996-11-14
JPH10503832A (ja) 1998-04-07

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